Ariadne / Blindsquare / RNIB Navigator
These are GPS apps that have been specially designed for use with a visual impairment. These apps can update you on your location or give you turn by turn directions to a place. These apps vary in price.

ScotTalk
This app is used when traveling on the bus. The app will tell you the 10 nearest bus stops and the timetable for the stops. It then has the ability to track your journey and will give you audio feedback of the next stop on the route. This is a free app.